Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's advent presents an average high-temperature of an enjoyable 18.2°C (64.8°F), indicating a slight variation from the conditions of the previous month. Throughout the month of September, Grendon Underwood witnesses an average low-temperature of 10.5°C (50.9°F).Humidity
In September, the average relative humidity is 81%.Rainfall
In Grendon Underwood, during September, the rain falls for 13.4 days and regularly aggregates up to 29mm (1.14") of precipitation. In Grendon Underwood, United Kingdom, during the entire year, the rain falls for 187.4 days and collects up to 476mm (18.74") of precipitation.Snowfall
In Grendon Underwood, snow does not fall in April through November.Daylight
In September, the average length of the day in Grendon Underwood is 12h and 39min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:43 pm BST.
Sunshine
In September, the average sunshine is 7.1h.UV index
The average daily maximum UV index in September in Grendon Underwood is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Frequently asked questions
What is the average September temperature in Grendon Underwood?
What is the average humidity in September in Grendon Underwood?
How many days does it rain in September in Grendon Underwood?
When it does not snow in Grendon Underwood?
How many hours of daylight does Grendon Underwood have in September?
When are sunrise and sunset in September in Grendon Underwood?
How many hours of sunshine does Grendon Underwood have in September?
What is the UV index reading in September in Grendon Underwood?
Average temperature in September
Grendon Underwood, United Kingdom
- Average high temperature in September: 18.2°C
The warmest month (with the highest average high temperature) is July (21.2°C).
The month with the lowest average high temperature is January (6.4°C).
- Average low temperature in September: 10.5°C
The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is January (1.5°C).
Average pressure in September
Grendon Underwood, United Kingdom
- Average pressure in September: 1016.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1010.2mbar).
Average wind speed in September
Grendon Underwood, United Kingdom
- Average wind speed in September: 13.2km/h
The windiest month (with the highest average wind speed) is February (18.3km/h).
The calmest month (with the lowest average wind speed) is July (12.8km/h).
Average humidity in September
Grendon Underwood, United Kingdom
- Average humidity in September: 81%
The month with the highest relative humidity is December (91%).
The month with the lowest relative humidity is August (78%).
Average rainfall in September
Grendon Underwood, United Kingdom
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is June (62mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Grendon Underwood, United Kingdom
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (21.1 days).
The month with the least rainy days is February (11.8 days).
Average snowfall in September
Grendon Underwood, United Kingdom
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (17mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Grendon Underwood, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grendon Underwood, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is July (Average sunshine: 7h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Grendon Underwood, United Kingdom
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is March (14.6 days).
The month with the least sunshine days is August (6.7 days).
Average UV index in September
Grendon Underwood, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grendon Underwood, United Kingdom
- Average cloud cover in September: 49
The month with the most cloud cover is November (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 49).
Average visibility in September
Grendon Underwood, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are February, March, April, May, June, July, August and December (9km).
The months with the lowest visibility are January, September, October and November (8km).
Grendon Underwood, United Kingdom
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